Borane;tetrahydrofuran → HCID 79138227, compound

Temperature

75 °C

To a stirring solution of 3-(2-fluoro-phenyl)-3-hydroxy-2,2-dimethyl-propionitrile (1.5 g, 7.76 mmol) in tetrahydrofuran was added a solution of borane-tetrahydrofuran complex (17 mL, 17.0 mmol, 1M in tetrahydrofuran). After bubbling ceased, the reaction mixture was heated to 75° C. for 4 hours and then allowed to cool to ambient temperature. Methanol (9 mL) was added dropwise followed by hydrogen chloride (9 mL, 4N in 1,4-dioxane). The resulting mixture was heated to reflux for 2 hours, allowed to cool to ambient temperature and then concentrated at reduced pressure. To the residue was added aqueous hydrochloric acid (5 mL, 1 N) followed by ethyl acetate (20 mL). The layers were separated and the aqueous layer was basified with aqueous lithium hydroxide (6 mL, 1 N) and this aqueous phase was extracted with dichloromethane (3×75 mL). The organic extracts were combined, washed with saturated aqueous sodium chloride (20 mL) and concentrated at reduced pressure to give the product as a colorless oil (1.3 g, 85%). 1H NMR (CDCl3) δ 7.53 (m, 1H), 7.25-7.05 (m, 2H), 6.94 (m, 1H), 5.06 (br s, 1H), 2.83 (q, J=12.5 Hz, 2H), 0.86 (d, J=8.5 Hz, 6H).

1. customAfter bubbling
2. temperatureto cool to ambient temperature
3. additionMethanol (9 mL) was added dropwise
4. temperatureThe resulting mixture was heated
5. temperatureto reflux for 2 hours
6. temperatureto cool to ambient temperature
7. concentrationconcentrated at reduced pressure
8. additionTo the residue was added aqueous hydrochloric acid (5 mL, 1 N)
9. customThe layers were separated
10. extractionthis aqueous phase was extracted with dichloromethane (3×75 mL)
11. washwashed with saturated aqueous sodium chloride (20 mL)
12. concentrationconcentrated at reduced pressure

ORD record

ord-a3104736ca16444a8cceb0925ef41cce

Source dataset

uspto-grants-2013_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08609849B1